#!/usr/bin/env python
# -*- coding: utf-8 -*-

# ***********************IMPORTANT NMAP LICENSE TERMS************************
# *                                                                         *
# * The Nmap Security Scanner is (C) 1996-2019 Insecure.Com LLC ("The Nmap  *
# * Project"). Nmap is also a registered trademark of the Nmap Project.     *
# * This program is free software; you may redistribute and/or modify it    *
# * under the terms of the GNU General Public License as published by the   *
# * Free Software Foundation; Version 2 ("GPL"), BUT ONLY WITH ALL OF THE   *
# * CLARIFICATIONS AND EXCEPTIONS DESCRIBED HEREIN.  This guarantees your   *
# * right to use, modify, and redistribute this software under certain      *
# * conditions.  If you wish to embed Nmap technology into proprietary      *
# * software, we sell alternative licenses (contact sales@nmap.com).        *
# * Dozens of software vendors already license Nmap technology such as      *
# * host discovery, port scanning, OS detection, version detection, and     *
# * the Nmap Scripting Engine.                                              *
# *                                                                         *
# * Note that the GPL places important restrictions on "derivative works",  *
# * yet it does not provide a detailed definition of that term.  To avoid   *
# * misunderstandings, we interpret that term as broadly as copyright law   *
# * allows.  For example, we consider an application to constitute a        *
# * derivative work for the purpose of this license if it does any of the   *
# * following with any software or content covered by this license          *
# * ("Covered Software"):                                                   *
# *                                                                         *
# * o Integrates source code from Covered Software.                         *
# *                                                                         *
# * o Reads or includes copyrighted data files, such as Nmap's nmap-os-db   *
# * or nmap-service-probes.                                                 *
# *                                                                         *
# * o Is designed specifically to execute Covered Software and parse the    *
# * results (as opposed to typical shell or execution-menu apps, which will *
# * execute anything you tell them to).                                     *
# *                                                                         *
# * o Includes Covered Software in a proprietary executable installer.  The *
# * installers produced by InstallShield are an example of this.  Including *
# * Nmap with other software in compressed or archival form does not        *
# * trigger this provision, provided appropriate open source decompression  *
# * or de-archiving software is widely available for no charge.  For the    *
# * purposes of this license, an installer is considered to include Covered *
# * Software even if it actually retrieves a copy of Covered Software from  *
# * another source during runtime (such as by downloading it from the       *
# * Internet).                                                              *
# *                                                                         *
# * o Links (statically or dynamically) to a library which does any of the  *
# * above.                                                                  *
# *                                                                         *
# * o Executes a helper program, module, or script to do any of the above.  *
# *                                                                         *
# * This list is not exclusive, but is meant to clarify our interpretation  *
# * of derived works with some common examples.  Other people may interpret *
# * the plain GPL differently, so we consider this a special exception to   *
# * the GPL that we apply to Covered Software.  Works which meet any of     *
# * these conditions must conform to all of the terms of this license,      *
# * particularly including the GPL Section 3 requirements of providing      *
# * source code and allowing free redistribution of the work as a whole.    *
# *                                                                         *
# * As another special exception to the GPL terms, the Nmap Project grants  *
# * permission to link the code of this program with any version of the     *
# * OpenSSL library which is distributed under a license identical to that  *
# * listed in the included docs/licenses/OpenSSL.txt file, and distribute   *
# * linked combinations including the two.                                  *
# *                                                                         *
# * The Nmap Project has permission to redistribute Npcap, a packet         *
# * capturing driver and library for the Microsoft Windows platform.        *
# * Npcap is a separate work with it's own license rather than this Nmap    *
# * license.  Since the Npcap license does not permit redistribution        *
# * without special permission, our Nmap Windows binary packages which      *
# * contain Npcap may not be redistributed without special permission.      *
# *                                                                         *
# * Any redistribution of Covered Software, including any derived works,    *
# * must obey and carry forward all of the terms of this license, including *
# * obeying all GPL rules and restrictions.  For example, source code of    *
# * the whole work must be provided and free redistribution must be         *
# * allowed.  All GPL references to "this License", are to be treated as    *
# * including the terms and conditions of this license text as well.        *
# *                                                                         *
# * Because this license imposes special exceptions to the GPL, Covered     *
# * Work may not be combined (even as part of a larger work) with plain GPL *
# * software.  The terms, conditions, and exceptions of this license must   *
# * be included as well.  This license is incompatible with some other open *
# * source licenses as well.  In some cases we can relicense portions of    *
# * Nmap or grant special permissions to use it in other open source        *
# * software.  Please contact fyodor@nmap.org with any such requests.       *
# * Similarly, we don't incorporate incompatible open source software into  *
# * Covered Software without special permission from the copyright holders. *
# *                                                                         *
# * If you have any questions about the licensing restrictions on using     *
# * Nmap in other works, we are happy to help.  As mentioned above, we also *
# * offer an alternative license to integrate Nmap into proprietary         *
# * applications and appliances.  These contracts have been sold to dozens  *
# * of software vendors, and generally include a perpetual license as well  *
# * as providing support and updates.  They also fund the continued         *
# * development of Nmap.  Please email sales@nmap.com for further           *
# * information.                                                            *
# *                                                                         *
# * If you have received a written license agreement or contract for        *
# * Covered Software stating terms other than these, you may choose to use  *
# * and redistribute Covered Software under those terms instead of these.   *
# *                                                                         *
# * Source is provided to this software because we believe users have a     *
# * right to know exactly what a program is going to do before they run it. *
# * This also allows you to audit the software for security holes.          *
# *                                                                         *
# * Source code also allows you to port Nmap to new platforms, fix bugs,    *
# * and add new features.  You are highly encouraged to send your changes   *
# * to the dev@nmap.org mailing list for possible incorporation into the    *
# * main distribution.  By sending these changes to Fyodor or one of the    *
# * Insecure.Org development mailing lists, or checking them into the Nmap  *
# * source code repository, it is understood (unless you specify            *
# * otherwise) that you are offering the Nmap Project the unlimited,        *
# * non-exclusive right to reuse, modify, and relicense the code.  Nmap     *
# * will always be available Open Source, but this is important because     *
# * the inability to relicense code has caused devastating problems for     *
# * other Free Software projects (such as KDE and NASM).  We also           *
# * occasionally relicense the code to third parties as discussed above.    *
# * If you wish to specify special license conditions of your               *
# * contributions, just say so when you send them.                          *
# *                                                                         *
# * This program is distributed in the hope that it will be useful, but     *
# * WITHOUT ANY WARRANTY; without even the implied warranty of              *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Nmap      *
# * license file for more details (it's in a COPYING file included with     *
# * Nmap, and also available from https://svn.nmap.org/nmap/COPYING)        *
# *                                                                         *
# ***************************************************************************/

import gobject
import gtk
import gtk.gdk
import pango
import re

import zenmapCore.I18N  # lgtm[py/unused-import]
from zenmapCore.UmitLogging import log
from zenmapCore.UmitConf import NmapOutputHighlight

from zenmapGUI.NmapOutputProperties import NmapOutputProperties


class NmapOutputViewer (gtk.VBox):
    HIGHLIGHT_PROPERTIES = ["details", "date", "hostname", "ip", "port_list",
            "open_port", "closed_port", "filtered_port"]

    def __init__(self, refresh=1, stop=1):
        self.nmap_highlight = NmapOutputHighlight()
        gtk.VBox.__init__(self)

        # Creating widgets
        self.__create_widgets()

        # Setting scrolled window
        self.__set_scrolled_window()

        # Setting text view
        self.__set_text_view()

        buffer = self.text_view.get_buffer()
        # The end mark is used to scroll to the bottom of the display.
        self.end_mark = buffer.create_mark(None, buffer.get_end_iter(), False)

        self.refreshing = True

        # Adding widgets to the VBox
        self.pack_start(self.scrolled, expand=True, fill=True)

        # The NmapCommand instance, if any, whose output is shown in this
        # display.
        self.command_execution = None
        # The position of the last read from the output stream.
        self.output_file_pointer = None

    def __create_widgets(self):
        # Creating widgets
        self.scrolled = gtk.ScrolledWindow()
        self.text_view = gtk.TextView()

    def __set_scrolled_window(self):
        # Seting scrolled window
        self.scrolled.set_border_width(5)
        self.scrolled.add(self.text_view)
        self.scrolled.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)

    def __set_text_view(self):
        self.text_view.set_wrap_mode(gtk.WRAP_WORD)
        self.text_view.set_editable(False)

        self.tag_font = self.text_view.get_buffer().create_tag(None)
        self.tag_font.set_property("family", "Monospace")
        for property in self.HIGHLIGHT_PROPERTIES:
            settings = self.nmap_highlight.__getattribute__(property)
            tag = self.text_view.get_buffer().create_tag(property)

            if settings[0]:
                tag.set_property("weight", pango.WEIGHT_HEAVY)
            else:
                tag.set_property("weight", pango.WEIGHT_NORMAL)

            if settings[1]:
                tag.set_property("style", pango.STYLE_ITALIC)
            else:
                tag.set_property("style", pango.STYLE_NORMAL)

            if settings[2]:
                tag.set_property("underline", pango.UNDERLINE_SINGLE)
            else:
                tag.set_property("underline", pango.UNDERLINE_NONE)

            text_color = settings[3]
            highlight_color = settings[4]

            tag.set_property(
                    "foreground", gtk.color_selection_palette_to_string(
                        [gtk.gdk.Color(*text_color), ]))
            tag.set_property(
                    "background", gtk.color_selection_palette_to_string(
                        [gtk.gdk.Color(*highlight_color), ]))

    def go_to_host(self, host):
        """Go to host line on nmap output result"""
        buff = self.text_view.get_buffer()
        start_iter = buff.get_start_iter()

        found_tuple = start_iter.forward_search(
                "\nNmap scan report for %s\n" % host, gtk.TEXT_SEARCH_TEXT_ONLY
                )
        if found_tuple is None:
                return

        found = found_tuple[0]
        if not found.forward_line():
            return
        self.text_view.scroll_to_iter(found, 0, True, 0, 0)

    def show_output_properties(self, widget):
        nmap_out_prop = NmapOutputProperties(self.text_view)

        nmap_out_prop.run()

        for prop in nmap_out_prop.property_names:
            widget = nmap_out_prop.property_names[prop][8]

            wid_props = []

            if widget.bold:
                wid_props.append(1)
            else:
                wid_props.append(0)

            if widget.italic:
                wid_props.append(1)
            else:
                wid_props.append(0)

            if widget.underline:
                wid_props.append(1)
            else:
                wid_props.append(0)

            wid_props.append("(%s, %s, %s)" % (widget.text_color.red,
                                               widget.text_color.green,
                                               widget.text_color.blue))
            wid_props.append("(%s, %s, %s)" % (widget.highlight_color.red,
                                               widget.highlight_color.green,
                                               widget.highlight_color.blue))

            self.nmap_highlight.__setattr__(widget.property_name, wid_props)

        nmap_out_prop.destroy()
        self.nmap_highlight.save_changes()
        self.apply_highlighting()

    def apply_highlighting(self, start_iter=None, end_iter=None):
        buf = self.text_view.get_buffer()

        if start_iter is None:
            start_iter = buf.get_start_iter()
        else:
            # Patterns are line-oriented; start on a line boundary.
            start_iter.backward_line()
        if end_iter is None:
            end_iter = buf.get_end_iter()

        buf.apply_tag(self.tag_font, start_iter, end_iter)

        if not self.nmap_highlight.enable:
            return

        text = buf.get_text(start_iter, end_iter)

        for property in self.HIGHLIGHT_PROPERTIES:
            settings = self.nmap_highlight.__getattribute__(property)
            for m in re.finditer(settings[5], text, re.M):
                m_start_iter = start_iter.copy()
                m_start_iter.forward_chars(m.start())
                m_end_iter = start_iter.copy()
                m_end_iter.forward_chars(m.end())
                buf.apply_tag_by_name(property, m_start_iter, m_end_iter)

    def show_nmap_output(self, output):
        """Show the string (or unicode) output in the output display."""
        try:
            self.text_view.get_buffer().set_text(output)
            self.apply_highlighting()
        except MemoryError:
            self.show_large_output_message(self.command_execution)

    def set_command_execution(self, command):
        """Set the live running command whose output is shown by this display.
        The current output is extracted from the command object."""
        self.command_execution = command
        if command is not None:
            self.text_view.get_buffer().set_text(u"")
            self.output_file_pointer = 0
        else:
            self.output_file_pointer = None
        self.refresh_output()

    def show_large_output_message(self, command=None):
        buf = self.text_view.get_buffer()
        try:
            running = (command is not None and command.scan_state() is True)
        except Exception:
            running = False
            complete = False
        else:
            complete = not running
        if running:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "Zenmap will continue to run the scan to completion. However,"
                " some features of Zenmap might not work as expected.")
        elif complete:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "The scan has completed. However, some features of Zenmap "
                "might not work as expected.")
        else:
            buf.set_text("Warning: You have insufficient resources for Zenmap "
                "to be able to display the complete output from Nmap here. \n"
                "The scan has been stopped. Some features of Zenmap might not "
                "work as expected.")

    def refresh_output(self, widget=None):
        """Update the output from the latest output of the command associated
        with this view, as set by set_command_execution. It has no effect if no
        command has been set."""
        log.debug("Refresh nmap output")

        if self.command_execution is None:
            return

        # Seek to the end of the most recent read.
        self.command_execution.stdout_file.seek(self.output_file_pointer)

        try:
            new_output = self.command_execution.stdout_file.read()
        except MemoryError:
            self.show_large_output_message(self.command_execution)
            return

        self.output_file_pointer = self.command_execution.stdout_file.tell()

        v_adj = self.scrolled.get_vadjustment()
        if new_output and v_adj is not None:
            # Find out if the view is already scrolled to the bottom.
            at_end = (v_adj.value >= v_adj.upper - v_adj.page_size)

            buf = self.text_view.get_buffer()
            prev_end_mark = buf.create_mark(
                    None, buf.get_end_iter(), left_gravity=True)
            try:
                buf.insert(buf.get_end_iter(), new_output)
                # Highlight the new text.
                self.apply_highlighting(
                        buf.get_iter_at_mark(prev_end_mark),
                        buf.get_end_iter())
            except MemoryError:
                self.show_large_output_message(self.command_execution)
                return

            if at_end:
                # If we were already scrolled to the bottom, scroll back to the
                # bottom again. Also do it in an idle handler in case the added
                # text causes a scroll bar to appear and reflow the text,
                # making the text a bit taller.
                self.text_view.scroll_mark_onscreen(self.end_mark)
                gobject.idle_add(
                        lambda: self.text_view.scroll_mark_onscreen(
                            self.end_mark))
